Dentifrice



I Patented Ma; 3, 1925.

.der which is-practically insoluble in s the two ingredients to be intimately mixed UNITED STATES PATENT 1,528,422 OFFICE.

GORDON I. HELSLEY, OI JAMAICA, NEW YORK.

DENTII'RICE.

No Drawing. Application filed May 6, To all whom-it mary concern.

Be it known that I, GORDON F. HELSLEY, a. citizen of the United States, residin at Jamaica, in the county of Queens and S tate of New York, have invented new and useful Im rovem'ent's'in Dentifrices, of which the foll dwing is a specification.

My invention relates to improvements in dentlfrices and more articularly to a dentifrice for cleaning e teeth, the essential feature of which is that there shall be first a pronounced acid reaction, afterward leavmg in the mouth cavit an alkaline reaction. It is well known t at dental caries and pyorrhea are becoming more prevalent and pronounced. This is attributed by medical authorities, very largely to an improper diet, and more particularly a failureto eat suflicient acid containing fruits. It is well known that the mere eating of an apple or graefruit has a remarkable cleansing effect on t e teeth. Acids, particularly fruit acids, prevent the formation of (and dissolve already deposited) tartar, which is the usual recursor of diseases of the teeth and gums. any authorities on diseases of the mouth have recommended the use of vegetable and fruit acids after eating. Normal reaction around the teeth is largely alkaline, and.v most authorities condemn the use of an acid dentifrice which tends to keep the teeth an acid medium for an indefinite period a er use. 'I have therefore devised a tooth powder of which the two essential finely pulverized solid acidwhich is quic soluble in saliva, and .(2) an alkaline Hewa Na,

to ther. x

en a. portion ,of this dry mixture is placed upon the tooth brush and applied to the teeth and gums, the. saliva, whose flow is stimulated by the acid in the mixture, will quickly dissolve the acid, so. that temporarily the teeth will be brushed with the acid reaction which is present, thereby furnishing the most advanta eous conditions. for cleansing the teeth. e other ingredient, the practical] insoluble alkaline powder, acts as a mec anical abrasive to facilitate the chemical action of the acid. After a period of brush and solution progresses to such an extent, that the acidity will bec'comtgletel neutrallzed. er'nione, while e alkaline in parts are (I?{ a 3 same characteristics.

ing, the interaction of the 1922. Serial No. 559,067.

gredient is practically ihsoluble in saliva, nevertheless a very --pronounced alkaline reaction. Rins: ing t e mouth with water, after brushing theteeth, removes any powder. g

The length of the period of acidity can be regulated by the amount of excess of alkaline powder and also by the degree of fineness of its trituration.

, It will be understood that the rinci 19" of this invention does not de en on t e specific ingredients used, provi ed they have .t 1e characteristics above described. I have prepared a dentifrice of powdered citric acid and preci itated chalk. These two inredients adm1rably fulfill the requirements or acid and alkaline powder respectively. It will of course be understood, t at I am not limited to these two articular substances and any other ingredients having the same chemical pro erties maybe used in lieu thereof. To this mixture I may add sugar of milk to act as a carrier, and a flavoring, such as'oil of sassafr'as or any'other desirable flavor, for the pur ose of'making the preparation agreeable. ne of the essential features of the mixture, is that no water or moisture is used in the reparation, otherwise the neutralization of t e acid will partially proceed before the dentifrice is used, and its value will be considerably lessened.

Fommla.

The dentifrice ma; be 'com ounded of the ingredients mentloned as ollows:

To one part of precipitated chalk of Hulk and oil of r oring extract as desired. These ingredients are to be well mixed together. As previously pointed out, the first two items may be vari and two parts 0 sugar according to sufficient will dissolve, to cause excess of alkalinecitric acid, add one art of i v pro ortions of the I the effect desired, and either one may be replaced by any other substance, having the The'last two items, viz: sugar of milk and flavoring extracts may be omitted altogether, or they may be replaced by any other substances which are not antagonistic to the chemical reaction desired. a

I claim: I I 1. A dentifrice consisting of a owdered mixture of citric acid and an alk powme der, said acid being rapidly soluble the practically insoluble in order to 2. A dentifrice consisting of a powdered mixture of citric acid, and precipitated chalk, said acid being rapidly soluble in the presence of saliva, while the. chalk is practically insoluble to initiall act as a mechanical abrasive, and secon arily completly neutralize the acid.

3. A dentifrice consisting of a powderedmixture of citric acid, precipitated chalk,

l 7 sugar of and a flavoring extract, said acid being rapidly soluble in the presence 5 of saliva, while the chalk is practically insoluble to initially act as a mechanical abrasive, and secondarily completely neutralize the acid.

In testimony whersof I have hereunto set 20 m hand in the presence of two subscribing witnesses. v- GORDON F. HELSLEY.

Witnesses:

Innz M. Sononms, WILLIAM MILLER. 

